Machine for making highly elastic resilient tubes



Oct. 11,-1932. ADREYER .A '1,882,182

MACHINE FOR MAKING HIGHLY ELASTIC RESILIENT TUBES fFiled Feb. 19. 19s; s sheets-sheet 1 /NveN-ra 1Q Oct. 11, 1932. A. DREYER 1,882,182

MACHINE FOR MAKING HIGHLY ELASTIC RESILIENT TUBES Filed Feb. 19, 1931 s sheets-sheet 2 Dr ef A? CNve/vfde A. DREYER Oct. l1, 1932.

MACHINE FOR MAKING HIHLY ELASTIC RESILIENT TUBES Filed Feb. 19. 1931` 3 Sheets-Sheet 5 F. FQ

-Mmm

i. tion of the roller.

Petentedoet. 1-1, 1932 1882182 UNITED STATES PATENT 0ppm; l i .lutnnn'r Daum, 0F LgmswiI-Tmmn .Application led February 19, 1981, SeriaLNo. 517,129,931?. :ln Germany December 20, 1980.

This inventionrelates to a4 machine for effected in any other way,.for instance5 by making highly elastic resilient tubes, or sorolling, or by hydraulic pressure. called bellows, such as are used as construc- In the case that corrugatedtubes are to be tional elements for thermostats, pressure conproduced having a bottom it is advisable, trolling apparatus, stui'ng boxes and the like. 'when using smooth tubes, to begin at the bot- 55 The new feature ofthe subject matter of tom in making the 'corrugations so as -to obthe invention7 as distinguished from` well tain corrugated resilient tubes 1n which the e lmown devices of similar kind which operate distances between the bottom and' the rst either incorrectly '.or vare very expensive, es corrugation are equal. When resilient tubes i sentially is that inner permanently rotating of thisv kind are made which are open at W pressure rollers automatically adapt themboth ends the production of the corrugation selves to the cam-like peripheral rib, decreasmay vbe begun at either` end or at any part ing in lwidth and increasing in depth, of an between-these ends.

outer intermittently' rotating pressure roller, A fultlfleiy feature of the invention resides are formed positively. The profile decrease the inventionallows of using a relatively ing in width and increasing in depth ofthe Shortandstii inner rolling spindle because outer pressure roller suitably comprises only the resilient tube is'made in one continuous about four-fths of the periphery of said process sothat,v in the case of resilient tubes -1 roller. While the rest of the peripheryrhas a having a .bottom,' the rolling spindle needs 7 0 profile of uniform small thickness and unionly to have a length which is equal to thatof form height, so 4that the resilient tube to be said tuba-while in the case of makin resilient made is compelled to make at least one comtubes which are open at both ends, t e rolling f plete revolution while running over this sec- Splndle has only one half of thelength of said ,n v tube.` ln -well known processes for rolling` 75@ By usiga machine according to the invencorrugated resilient tubes, the longitudinal tion not only the expenses of production of 4 contraction of the originally long tube is vefresilienttubes are lowered butals'o'the qualfected successively in several stages so that, ity of such tubes is .remarkably improved befor the rSt stages of rolling, where the tubeo Cause in Consequence-0f a most uniformdisis still long, relatively long rolling spindles @0 tribution of the material' it is not subject to must be used which, of course, are not so stiff overstraining. and rigid as the spindles' used when using the By means of the machine construouid,ac-v machine according to the present invention. cording to the invent-ion not'only relimina- In the acompanying drawings there `S i rily corrugated but also smooth tu es may b e Shown for purposes of illustration only, 'and '85 used for'converting them into resilient tubes. Y in more orless diagrammatic manner; 'a pre- The use ofpreliminarily corrugated tubes .in' ferred embodiment ofthe present invention, stead of smooth tubes has the-advantage orE-a it being understood that the drawings' do not better distribution of the material. f .define the limits ofthepresent invention as The preliminary corrugation of thetubes changes in the construction and operation may be effected in any well known manner. disclosed therein may be made withoutde- For this purpose' it is particularly advisable parting either from the spirit of the present -to use a caoutchouc die which by means of a invention or the scope of the broader claims.4

displaceable 'fnetallic.V plunger is pressed ln, the drawin s:

whereby the corrugations of the'resilient tube in the fact that the new method according to @5 against a stationary metallic support` and Fig. 1 is a p an view of the machine, 95

thereby compressed s o that by the radial ex- Fig. 2 an end view of the same, pansion of said caoutchouc die that part of the Fig. 3 a longitudinal sectional view on the 1 wall whichcovers the annular grooves of the line 3- 3 of Fig. 1 on an enlarged scale, matrix is formed into corrugations. The pre- Fi s. 4 and 5, 6 'and 7 'are detail views U liminary corrugation of the tube may also be 4showing the working'positions of the 4tools 100 .,ley 7 rotated by mediate gearing which is provided with coubelt to run always by means the lining 1 gated resilient tube.,

are so adjusted, that theyifit as exactly as poswhen operating on preliminarily corrugated and on smooth tubes.

Referring to Figs. 1-3 of the drawings '1 indicates the head-stock and 2 (Figs. 1 and 2) a 5 roller supporting plate, preferably carried spindle 6, so as to allow of a relatively reciprocal longitudinal displacement of the two spindles. On that end ofthe spindle 5 which projects from the bearing 4 is fastened a pula belt driven by an interpling and uncoupling means. `The pulley is preferably provided with a transversely curved rim for thepurpose of compelling the in the plane of symmetry of the pulley in whatever displaced position said pulley may be.

A groove 8 (Fig. of a tongue 9, which has for its purpose to transmit the rotation of the spindle 5 to the spindle 6. At its other end the spindle 5 is rovided with female thread 10 into which the lnner rolling spindle 11 may be screwed. The spindle 6, at its end lying outside the bearing 41, is provided with a chuck 12 serving for the reception of anintermediate centering lining 13, which is screwed into said chuck. A .nut-lock 14 having the form of a collar serves for locking the centering lining 13. For this purpose the nut-lock 14 has a gap 15 which by means of a screw 16 may be narrowed so as to lock the nut-lock 14 and prevent its displacement during the operation of the machine. `The centering lining 13 is provided with female thread into which the outer rolling spindle 17 is screwed. Said spindle 17 possesses a polygonal collar 18 for tightening or loosening the rolling-sp1ndle'17 of a fork-wrench. The centering lining 13 may be made -in one piece with the outer rolling spindle 17, 18. By screwing i 13 or the spindle 17- more'oi` less into the chuck 12, .thedistance between the two pressure-rollers 19, 20 may be adjusted. Thisdistance of the two inner pressure-rollers depends on the required height of the corrugations or on the The rollers 19 and 20 sible. into the preliminarily rolled inner rooves 21 of the tube 22, as represented in i 4. I i gor the purpose'of enabling the spindles 5 and 6 'to belongitudinally displaced during their rotation they are provided with bronzebushes 23 and 24 (Fig. 3.) These bushes are rotatable between end-bearings 25, 251 and 26, 261 respectively.- j

A lateral displacement of thel bronze- 95 bushes' on the spindles is prevented by col- The head-stock 1 is provided with two beary 3) serves for the reception 2. The

by meansof a nut lars 27, 28 and by adjusting l ring 29 beingscrewed on the spintdle 5 and ring 30 on the spindle 6.- The rings 29 and 30 are fixed in their respective positions by screws 31 and 32 respectively.

The lateral displacement of the bronzebushes 23 and 24 and, therefore, of the spindles 5 and 6 is effected by fork-levers 33 and 34 (Fig. 1) the prongs of which em.- brace the bushes 23 and 24 by .the bell-shaped parts 35 'and 36 respectively. Said bellshaped parts by means of screw-plugs 37, 371 and 38, 381 respectively are pivotally connected with the said bronze-bushes. The

rear ends of the prongs of the ir'ork-levers 33 and 34 are rotatably fastened to the pillars 39, 40 respectively mounted on the base -plate of the head-stock 1. `At their other ends. the fork-levers 33 are connected by links 42, 43, 44. The link 42 with its centre is pivotally mounted on a' pillar 41 which is fastened to the base-plate ofthe head-stock 1. This link 42 by means of the intermediate links 43 and 44 and the screw-plugs 45, 46, 47 and 48 is pivotally connected to the fork levers.

The lever 42 has'an extension 49 which is engaged by a draw-sring 50. The said extension 49 is provided with a number of holes 51 into each of which the end of the spring may be hooked so that the leverage rinus 29, 30,

may be changed according tol circumstances.

LThe other end of the spring 50 is fastened to a plug 52 mounted on the base-plate 2 eventually capable of being adjusted.

and

Pivotally mounted'on the plug 47 is a part 53 the free end of which forms a threaded bolt 56. On a screw-plug 61 a part 54 is pivotally mounted the freeend 'of which forms a threaded bolt 57 One of these threaded bolts or screws has right-handed thread and the other one left-handed thread. A nut 58 one half of which is provided with righthanded inner thread'V and the other half orl which is provided with left-handed inner thread is screwed on the threaded bolts or screws 56 and 57. According to the direction in which the nut is turned the distance between the plugs 47 and 61 is increased or decreased. distance of the preliminary corrugations of the preliminarily corru- The plug 61 is fastened to a lever 62, which is pivoted on a plug 631 fastened to the plate free end of said lever 62 Ais provided with a handle 63. On the base-plate 2 are mounted ball-bearings 64, 65 which carry the axle 66.

.The axle 66 carries a collarv 68 against. which the pressure-roller 67 is firmly pressed 69 for the purpose ofi-igidly connecting the saidV pressure roller to The pressure-roller 67 at its periphery is provided with a cam-like rib or ring 70 having a cross-section decreasing in'width and increasing' in height.. For producing one corrugation the pressure-roller or disc 67 makes only one revolution, and for this purpose it begins with the broad low portion of the profile fitting into the preliminaryE corrugation of a preliminarily corrugated tube 22 (Fig. 4), and ends with the high narrow portion of the profile (Fig.v).

- If a tube 22? having a smoothwall (Figs. 6 and 7) is to be corrugated the low broad profile of the cam-like rib 70 at the beginning of the revolution of the roller or disc 67 lies `close tothe outside of the tube 221 (Fig. 6).

At that point where the broad profile of the ring 70 begins and the narrow profile terminates isarranged a recess 7 1 (Fig. 2).

The disc shaped roller 67 at the moment when the recess 71 is situated between the two pressure-rollers 19, (Fig, 2) is arrested by a stop 72 (Fig. l) engaging a hole 73 of the roller 67 in which position the corrugation operated upon is inished"(Figs.

5 and 7). After finishing each corrugation the tube 22 or 221 is released.

The decreasing prole ofv the disc shaped roller 67 extends only to about four-fifths of the periphery of said roller while the remaining one fifth of the periphery of said roller shows a uniformly thin profile, the length of which is at least lequal to the inner diameter of the finished corrugation so that the resilient tube makes at least one complete revolution whileit is operated upon Yby said thin portion of the profile whereby all c011- rugations are made uniform.

The stop 72 (Fig. 1) is situated -in a sleeve 74 and, by means of a spring arranged in said sleeve is pressed aga-inst the roller 67..

The othere-nd of the stop 72 has a perpendic, ularly bent projection 7 6 which engages a slot 75 of the lever 62.

'Ihe adjusting screw 77 allows of an exact adjustment of the base plate 2 and of the discshapedroller 67 in relation tothe inner rollers 19,20.

The. corrugating device operates as follows: The spindles 5 and 6 and consequently the inner rollers 19, 20 rotate continuously. Then the operator with his right hand takes the tube 22 (or 221) and brings itfinto a po-v sition which is as nearly as possible parallel to thespindle 'of the head stock. His left hand seizesthe handle 63. The disc shaped4 roller is in its initial position, as shown in Fig. 2, so that the tube may be pushed on the rotating rollers 19, 20 and the first depression which is to be formed between the two waves lies between the said rollers 19, 2() (Figs. 4 and 6). Now the operator turns the handle 63 to the left in the direction of the arrow I (Fig. 1) whereby the two inner rollers 19, 2O by means of the levers 33 and `34 and the links 42,43 and 44 are moved apart symmetrically. rI`he handle 63 havingreached its end position and the stop 72 being thereby uncoupled and the tube 22.

leased. On account of the fact that the broader portion of the profile 70 of the roller 67 is heavier than the lowerv thin portion of the profile and that due to the ball bearing the resistance to be overcome is onlyweak the roller 67 will'at once begin its rotation'and is further driven by the rotating discs 19,v 20

In the moment the disc shaped roller 67 63"is released so as to return toits initial po sition. The spring at the same time pushes the lever 49 back and presses therebyboth rollers 19, 20 towards each other thereby eX- ercising a pressure on both flanks of the cor- ,rugation being formed. In.Y this way the ianks of the corrugations are strongly pressed against the rib 70 of the disc shaped roller 67 thereby avoiding the formation of folds and facilitating the formation ofthe corrugations and effecting perfectly smooth corrugations.

As Bsoon -'as the rollerv 67 has made a comi plete'revolution, the lever 62 will be returned to its initial position, and the stop 72 engages 'comes between the rollers 19, 20, the handle again the hole 73 of the disc 67 whereby this disc is stopped. `The operator displaces now the tube` 22 a distance equal tothe width of one corrugation and: operates again the handle 63 as before described so that theparts are again inthe position shown yin Figs. 4

and 6.

sible to make 40 resilient tubes per hour-of The manufacture of eachcorrugation takes` 'only a few seconds. It is,'for instance, posabout 26 millimeters inner diameter and 38 I millimeters outer diameter and havingeach f 30 corrugations. rlhese 1200 corrugations require only l H. P. The tube corrugating machine according to the present invention in contradistinction to known machines of What I claim is: l 1. Ina machine for making highly elastic iin similar kind works extremely economically. I

resilient tubes having annular corrugations',i

the combination of pressure rollers wor-king Iinside the-tube to be furnished lwith corr/ugations, a roller. working outside said tube,

a cam-like rib arranged at the periphery of said roller andv provided with a'transverse recess in its peripheral surface for cooperating with'the tube and the rollers at the initial starting of the machine.

2. In a machine for making highly elastic resilient tubes having annular corrufrations,

the combination of relatively movable pres-I sure rollers working inside the' tube to be furnished with corrugations, a roller working outside said tube, a cam-like rib arranged at the periphery of said roller and provided with a vtransverse recess in its periphery, and the cross-section of said rib beginning from said recess decreasing in width and increasing in height.

8. In a machine for making highly elastic resilient tubes having annular corrugatlons, the combination of two rollers worklng 1nside the'tube-to be furnishedwith corrugations, a spindle to which one of saidrollers is fastened, a' hollow spindle to which the other roller is fastened and in which the said iirst spindle is axially arranged and a coupling arranged between said spindles and allowing o their reciprocal axial adjustment and compelling them to turn jointly.

4. In a machine for making highly elastic resilient tubes having annular' corrugations.

the combination of an inner spindle carrying one of two rollers' and an outer spindle carrying the other one of said two rollers, and a pulley fastened to the-inner spindle,.and a with the roller carrying spindles and -procoupling arranged between 'said spindles and allowing of their reciprocal axial adjustment and compelling them to turn jointly.

5. In a machine for making highly elastic resilient tubes having annular corrugations, the combination of two reciprocally adjustable and rotatable roller carrying spindles, a coupling arranged between said spindles and allowing of their reciprocalaxial adjustment and compelling them to -turn jointly, and two levers, one being pivotally connected with one of said spindles andthe other one being lpivotally connectedxwith the other spindle.

\6. In a machine for making highly 'elastic resilient tubes having annular corrugations, the combination of two rollers, two recipro cally adjustable and rotatable spindles each carrying one of the rollers, a coupling ar ranged between said spindles and allowing of their reciprocal axial adjustment and compelling them to turn jointly, and two-levers, one bein said spin les and the other o ne being pivotally connected necting links between said levers.

7. In a machine for making highly elastic 'resilient tubes having annular corrugatlons f the combination of two'reciprocally adjustable and rotatable roller carrying spindles, and two levers', one being pivotally connected with one of said spindles and the other one being pivotally connected with the other spindle, connecting links between said levers, an extension on one of said links, a lever, means for adjustably connecting said extension with said lever, a spring acting on theextension,

a stop connected with said' lever, and a rotatably mounted disc shaped roller cooperating vided with a hole for cooperating with the stop. v A

In testimony whereof I aiiix my signature.

ALBERT DREYER.

pivotally connected with one of with lthe other spindle, and con- 

